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drm/vmwgfx: Fix up user_dmabuf refcounting 

If user space calls unreference on a user_dmabuf it will typically
kill the struct ttm_base_object member which is responsible for the
user-space visibility. However the dmabuf part may still be alive and
refcounted. In some situations, like for shared guest-backed surface
referencing/opening, the driver may try to reference the
struct ttm_base_object member again, causing an immediate kernel warning
and a later kernel NULL pointer dereference.

Fix this by always maintaining a reference on the struct
ttm_base_object member, in situations where it might subsequently be
referenced.

Cc: <stable@vger.kernel.org>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
This commit is contained in:
Thomas Hellstrom 2015-09-14 01:13:11 -07:00
parent 9fbcc7c007
commit 54c12bc374
6 changed files with 39 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
View File

@ -631,7 +631,8 @@ extern int vmw_user_dmabuf_alloc(struct vmw_private *dev_priv,
uint32_t size,
bool shareable,
uint32_t *handle,
struct vmw_dma_buffer **p_dma_buf);
struct vmw_dma_buffer **p_dma_buf,
struct ttm_base_object **p_base);
extern int vmw_user_dmabuf_reference(struct ttm_object_file *tfile,
struct vmw_dma_buffer *dma_buf,
uint32_t *handle);
@ -645,7 +646,8 @@ extern uint32_t vmw_dmabuf_validate_node(struct ttm_buffer_object *bo,
uint32_t cur_validate_node);
extern void vmw_dmabuf_validate_clear(struct ttm_buffer_object *bo);
extern int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
uint32_t id, struct vmw_dma_buffer **out);
uint32_t id, struct vmw_dma_buffer **out,
struct ttm_base_object **base);
extern int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
extern int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,

6
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
View File

@ -1236,7 +1236,8 @@ static int vmw_translate_mob_ptr(struct vmw_private *dev_priv,
struct vmw_relocation *reloc;
int ret;
ret = vmw_user_dmabuf_lookup(sw_context->fp->tfile, handle, &vmw_bo);
ret = vmw_user_dmabuf_lookup(sw_context->fp->tfile, handle, &vmw_bo,
NULL);
if (unlikely(ret != 0)) {
DRM_ERROR("Could not find or use MOB buffer.\n");
ret = -EINVAL;
@ -1296,7 +1297,8 @@ static int vmw_translate_guest_ptr(struct vmw_private *dev_priv,
struct vmw_relocation *reloc;
int ret;
ret = vmw_user_dmabuf_lookup(sw_context->fp->tfile, handle, &vmw_bo);
ret = vmw_user_dmabuf_lookup(sw_context->fp->tfile, handle, &vmw_bo,
NULL);
if (unlikely(ret != 0)) {
DRM_ERROR("Could not find or use GMR region.\n");
ret = -EINVAL;

2
drivers/gpu/drm/vmwgfx/vmwgfx_overlay.c
View File

@ -484,7 +484,7 @@ int vmw_overlay_ioctl(struct drm_device *dev, void *data,
goto out_unlock;
}
ret = vmw_user_dmabuf_lookup(tfile, arg->handle, &buf);
ret = vmw_user_dmabuf_lookup(tfile, arg->handle, &buf, NULL);
if (ret)
goto out_unlock;

29
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
View File

@ -354,7 +354,7 @@ int vmw_user_lookup_handle(struct vmw_private *dev_priv,
}
*out_surf = NULL;
ret = vmw_user_dmabuf_lookup(tfile, handle, out_buf);
ret = vmw_user_dmabuf_lookup(tfile, handle, out_buf, NULL);
return ret;
}
@ -481,7 +481,8 @@ int vmw_user_dmabuf_alloc(struct vmw_private *dev_priv,
uint32_t size,
bool shareable,
uint32_t *handle,
struct vmw_dma_buffer **p_dma_buf)
struct vmw_dma_buffer **p_dma_buf,
struct ttm_base_object **p_base)
{
struct vmw_user_dma_buffer *user_bo;
struct ttm_buffer_object *tmp;
@ -515,6 +516,10 @@ int vmw_user_dmabuf_alloc(struct vmw_private *dev_priv,
}
*p_dma_buf = &user_bo->dma;
if (p_base) {
*p_base = &user_bo->prime.base;
kref_get(&(*p_base)->refcount);
}
*handle = user_bo->prime.base.hash.key;
out_no_base_object:
@ -631,6 +636,7 @@ int vmw_user_dmabuf_synccpu_ioctl(struct drm_device *dev, void *data,
struct vmw_dma_buffer *dma_buf;
struct vmw_user_dma_buffer *user_bo;
struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
struct ttm_base_object *buffer_base;
int ret;
if ((arg->flags & (drm_vmw_synccpu_read | drm_vmw_synccpu_write)) == 0
@ -643,7 +649,8 @@ int vmw_user_dmabuf_synccpu_ioctl(struct drm_device *dev, void *data,
switch (arg->op) {
case drm_vmw_synccpu_grab:
ret = vmw_user_dmabuf_lookup(tfile, arg->handle, &dma_buf);
ret = vmw_user_dmabuf_lookup(tfile, arg->handle, &dma_buf,
&buffer_base);
if (unlikely(ret != 0))
return ret;
@ -651,6 +658,7 @@ int vmw_user_dmabuf_synccpu_ioctl(struct drm_device *dev, void *data,
dma);
ret = vmw_user_dmabuf_synccpu_grab(user_bo, tfile, arg->flags);
vmw_dmabuf_unreference(&dma_buf);
ttm_base_object_unref(&buffer_base);
if (unlikely(ret != 0 && ret != -ERESTARTSYS &&
ret != -EBUSY)) {
DRM_ERROR("Failed synccpu grab on handle 0x%08x.\n",
@ -692,7 +700,8 @@ int vmw_dmabuf_alloc_ioctl(struct drm_device *dev, void *data,
return ret;
ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
req->size, false, &handle, &dma_buf);
req->size, false, &handle, &dma_buf,
NULL);
if (unlikely(ret != 0))
goto out_no_dmabuf;
@ -721,7 +730,8 @@ int vmw_dmabuf_unref_ioctl(struct drm_device *dev, void *data,
}
int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
uint32_t handle, struct vmw_dma_buffer **out)
uint32_t handle, struct vmw_dma_buffer **out,
struct ttm_base_object **p_base)
{
struct vmw_user_dma_buffer *vmw_user_bo;
struct ttm_base_object *base;
@ -743,7 +753,10 @@ int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
prime.base);
(void)ttm_bo_reference(&vmw_user_bo->dma.base);
ttm_base_object_unref(&base);
if (p_base)
*p_base = base;
else
ttm_base_object_unref(&base);
*out = &vmw_user_bo->dma;
return 0;
@ -1004,7 +1017,7 @@ int vmw_dumb_create(struct drm_file *file_priv,
ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
args->size, false, &args->handle,
&dma_buf);
&dma_buf, NULL);
if (unlikely(ret != 0))
goto out_no_dmabuf;
@ -1032,7 +1045,7 @@ int vmw_dumb_map_offset(struct drm_file *file_priv,
struct vmw_dma_buffer *out_buf;
int ret;
ret = vmw_user_dmabuf_lookup(tfile, handle, &out_buf);
ret = vmw_user_dmabuf_lookup(tfile, handle, &out_buf, NULL);
if (ret != 0)
return -EINVAL;

2
drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
View File

@ -855,7 +855,7 @@ static int vmw_shader_define(struct drm_device *dev, struct drm_file *file_priv,
if (buffer_handle != SVGA3D_INVALID_ID) {
ret = vmw_user_dmabuf_lookup(tfile, buffer_handle,
&buffer);
&buffer, NULL);
if (unlikely(ret != 0)) {
DRM_ERROR("Could not find buffer for shader "
"creation.\n");

11
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
View File

@ -46,6 +46,7 @@ struct vmw_user_surface {
struct vmw_surface srf;
uint32_t size;
struct drm_master *master;
struct ttm_base_object *backup_base;
};
/**
@ -656,6 +657,7 @@ static void vmw_user_surface_base_release(struct ttm_base_object **p_base)
struct vmw_resource *res = &user_srf->srf.res;
*p_base = NULL;
ttm_base_object_unref(&user_srf->backup_base);
vmw_resource_unreference(&res);
}
@ -851,7 +853,8 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
res->backup_size,
true,
&backup_handle,
&res->backup);
&res->backup,
&user_srf->backup_base);
if (unlikely(ret != 0)) {
vmw_resource_unreference(&res);
goto out_unlock;
@ -1321,7 +1324,8 @@ int vmw_gb_surface_define_ioctl(struct drm_device *dev, void *data,
if (req->buffer_handle != SVGA3D_INVALID_ID) {
ret = vmw_user_dmabuf_lookup(tfile, req->buffer_handle,
&res->backup);
&res->backup,
&user_srf->backup_base);
if (ret == 0 && res->backup->base.num_pages * PAGE_SIZE <
res->backup_size) {
DRM_ERROR("Surface backup buffer is too small.\n");
@ -1335,7 +1339,8 @@ int vmw_gb_surface_define_ioctl(struct drm_device *dev, void *data,
req->drm_surface_flags &
drm_vmw_surface_flag_shareable,
&backup_handle,
&res->backup);
&res->backup,
&user_srf->backup_base);
if (unlikely(ret != 0)) {
vmw_resource_unreference(&res);